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Sudoku puzzles disjoint groups (Su Doku)

My database includes 656 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 4x4 box contains the digits 1 through 16. The cells with the same color must also contain the digits 1 through 16. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

198010 puzzles downloaded.

  2     12     3   4   5        
    8 1 4     9 11     6        
                14           13  
7       6     2   8 13   9   1 4
    13         4   12 10   7 9    
  1             7       15 11    
5 7             8         10    
10 4             3   9       8 6
14 11       5   16             15 1
    1         15             5 11
    10 15       11             3  
    4 13   6 3   1         7    
3 10   12   7 6   4     9       15
  8           12                
        9     10 12     16 1 3    
        11   2   5     3     6  
Showing puzzle number: 553
Puzzletype: Symmetrical Sudoku
Startnumbers: 82
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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